Azo dye and process of making same.



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LAND? ASE IGNOF, T0 THE ANILINE 6030B EfiltJ'HiERLY Jill-553T fitEl GrY fifi BASEL, SWITZERLAND.

A'NB FPBOCESS OF MAKING SAME.

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Elle Drawing.

Specification of Letters Patent.

pplication filed June Id, 1969, serial No. 501,443. Renewed October 6, 1.910. Serial No.

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To all whom it may concern:

Be it known that I, BERNHARD RICHARD, doctor of philosophy and chemist, a citizen of Germany, and a residentof Basel, Switzerland, have invented certain new and use- 'ful Improvements in Azo Dyestufis and Processes of Making Same, whereof the following is a specification.

The invention relates to the manufacture of new ortho-oxy-disazo coloring matters of the type in which R represents the residue of an aromatic sulfonic or carboxylic acid or a derivative or substitution product, and R represents the radical of an azo coloring matter component. These coloring matters, dyeing wool from acid bath after subsequent treatment with a chromate in diilerent shades ranging from green to brown and black, are distinguished by an extreme fast nose to the-action of light smiths proc 3 ling potting, They s o para amino-meta g matters of the type such as diazochloro-anilinand diazonitranilin sulfonic acids. With other diazo derivatives for example the diazosulfanilic or the diazo m-sulfanilic acid the combination takes place under ordinary conditions only in small part, while the greater part of the diazo 'sulfonic acid is decomposed with strong foaming. Then the interesting observation was made that this decomposition can be mostly avoided if the coupling is performed in the presence of the salts of certain thioacids. As particularly suitable for this purpose may be mentioned the thiosulfates, sulfocyanids and Xanthogenates. Hereby it appears that more stable compounds of the diazo bodies are formed which in the gradual combination with the amino cresol are not so easily destroyed. Also the combination of the diazo-bodies, which couple satisfactorily without the addition of the above mentioned thiosalts, is accomplished more smoothly in the presence of the latter.

The following examples will serve to further illustrate the nature of this invention but the invention is not confined to these examples.

A, Preparation of the new p ara amino-mwianeg-cs0 coloring matters.

Example 1: 22 kilos of metarnitranilinpara-sultonic acid are transformed in. the well known manner into the diazo compound which is isolated. The yellow diazo compound suspended in a little Water is poured while stirring into a solution contoining 16 kilos of hydrochlorid of metaumino-para-cresol. The con'lbination begins iu'imcdiately and will be finished after several hours upon additionof 5 kilos of sodium acetate. The orange colored dyestuff is filtered ofi', pressed and can be further worked up in this form. T he free sultonic acid of the dycstuff dissolves in hot water with an orange yellow color; by addition of an alkali the color turns to blue red.

Example 2: The diazo compound produced from 173 kilos of sulfanilic acid is isolated, suspended in water and allowed to run into a solutionl containing 16 kilos of 'hydrochloi'id of m ta-amino-para-cresol to which had been add d a solution of 25 kilos of sodium thlosulfate. The reaction commences at once and the mass takes a deep orange color. The coloring matter pro duced separates and is filtered oft after about twelve hours and washed with water. The meta-amino-para-cresol in the filtrate which has not yet completely entered into combination can be made useful for the production of coloring matters by further addition of diazosulfanilie acid. The thus obtained dyestutf dissolves in water with an orange color which turns red by addition of an alkali. From an acid bath it dyes wool orange. On being treated with clironiates the shade becomes more brown. of the thiosulfate a salt of another of the mentioned'thioacids is applied, the process is the same.

B. Preparation of the ortho-omy-ctisazo cotorz'ng matters.

Example 1: 30.7 kilos of the coloring matter obtained by coupling. diazosulfanilic acid with meta-amino-para-cresol are dissolved in water with G kilos of sodium carhouate and after addition of 7 kilos of: sodium nitrite acidulated with hydrochloriz acid. The diazotization, which can be accelerated by slight warming, is finished after a short time, and the brown yellow diazo compound is then isolated. It is suspended in a. little water and the paste is introduced into a cooled concentrated solution of sodium betanaphtholate containing 14.5 tholto whichis added 25 kilos of ammonia oi 20 percent. As the diazo compound dissolves with red color the dark colored bronze like product of reaction separates at the same time. They reaction is soon finished. The mass is diluted with water, warmed up, the coloring matter then precipitated by the addition of some common salt, filtered oll pressed and dried. It forms a bronzy shining black powder, soluble in water with a violet color turning bluish green by the addition of ammonia. in concentrated sulfuric acid it dissolves with a greenish color. in an acidulated bath wool is dyed claret; by after-treating with bicl'iromatc it develops a bluish green color fastto light, milling and potting.

Example 2: The diazo compound produced according to Example 1 is added to a cooled solution of 14.5 kilos of alpha-naph thol in 76 kilos of caustic soda lye 86 lie. The thick mass becomes blue black. is diluted with water after the reaction is complete and .is neutralized. with hydrochloric acid. The obtained coloring matter is isolated in the usual manner and carefully dried. It forms a bronze like dark powder which dissolves in concentrated sulfuric acid with a green color. Its aqueous solution is violet and turns to green blue with ammonia.

Example 3: The diazo compound obtained according to Example 1 is caused to run while stirring into a solution of 12.2 kilos If in place kilos beta naphtion. of ammonia. It in the place of the coloring matter made from sulfanilic acid and meta-amino-para cresol amino-oxy-azo compounds are employed, which contain instead of sulfanilic acid in the first place other sul' fonicor carboXylic-acids, the diazotization proceeds in exactly the same way.-- Further reaction is effected with the end components in the same manner.

In the following table a series of coloring matters produced after the described proccsses are listed together with the shades of their direct dyeings on wool as well as the shades of dyeings treated with bichromate:

Shade on wool.

The acid coni- 1- bined with in- End group. After auuin -pe1esol. Acid. treated wihh biehromatte.

Sullauilicaeid... Beta-naphtho... Claret-colored Bluegreen. M-sullauilieacill fBetn-naphthoh. Blulsn claret Blue green.

colored. Sullanilieaeirl :enaplithol.. Dull red Dullyellow violet. green. Sulianillcaeid... llesorcin Yellow red Gray black.

brown Sulfanllieacid... 1l-di0xynaph- Blue Bluegreen. thalcne3-6- llisulionie acid. Sulfanilicaeid... 2 5 a mi 11 o- Red vio1et.... Blue green.

naphtholfi sull'onica d. Sullanilieaei l. Meta-ioluylae Dark red Olivebrown.

diaiuin. l brown. Metn-nilrauilin Beta-naphthol Dull red Bluegreeu.

para sullonie violet. ac Ulll10(.lll1ilzilll- Betamaphthoh. Dull red Blue green.

liu-iu-sullonic violet. acid. l-naphthylamin lleta-naphthohu Dull violet... Olivegreen.

3-(l lisul[onic ac'l. 'laia amino- 27-r.aphthol Claret 001- Green. benzoic acid. monosulionic cred.

acid. Sullanilieacid... 2-7-dioxynapli- Claret eol- Blacklsh thalene. mcd. green.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. The process of manufacturing oxydisazo coloring matters, which process conin first combining a diazotized aromat1e amin, containing an acid radical, with m -amino-1')-cresol in acid solution in the presence of a thiosalt, secondly rediazotizing the product obtained and finally coupling the diazo-oxyazo compound thus obtained with an azo coloring matter compo nent.

E2. The process of manufacturing oxydisazo coloring matters, which process consists in first combining a diazotized aromatic 'amin, containing an acid radical, with m-'amino-p-cresol in acid solution in the said colorin matter being a bronze-like 4. As a new article of manufacture, the oXydisazo coloring matters having the general type R representing the residue of an aromatic acid, R representing the radical of an azo coloring matter component, said coloring matters dyeing wool after chromate treatment in shades ranging from green to brown and black, said dyed shades being fast to light, milling and potting.

5. As a new article of manufacture a coloring matter having the constitution In testimony whereof I have signed this shining blac ish powder, soluble in water specification in the presence of two subscribbluish green by the addition of ammonia,

\ with a violet color, the solution turning ing Witnesses.

BERNHARD RICHARD.

Witnesses GEORGE GIFFonD, ARNOLD ZUBER. 

